Copy quotation to new invoce

i used to be able to copy a quote to an invoice and it would work perfectly. Now it only copies the qty and amount. My descriptions are no longer copied to the invoice. Why is this and how do i fix it.

Please share the screenshots

Show the Edit screens, not the View screens.

Also, is the Line description box checked on the sales invoice? This can be permanently selected under Form Defaults.

Is there a box to tick - Line Descriptions in the invoice edit page?

Yes:

Screen Shot 2021-10-02 at 10.49.34 AM